package com.hjt.gulimall.ware.config;

import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import com.baomidou.mybatisplus.extension.plugins.pagination.optimize.JsqlParserCountOptimize;
import org.apache.ibatis.reflection.MetaObject;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.transaction.annotation.EnableTransactionManagement;

import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.util.Date;

/**
 * @author:97007
 * @date:2021/9/12 12:53
 */
@Configuration
@EnableTransactionManagement
@MapperScan("com.hjt.gulimall.ware.dao")
public class MybatisPlusConfig {
    // 旧版
    @Bean
    public PaginationInterceptor paginationInterceptor() {
        PaginationInterceptor paginationInterceptor = new PaginationInterceptor();
        // 设置请求的页面大于最大页后操作， true调回到首页，false 继续请求  默认false
         paginationInterceptor.setOverflow(false);
        // 设置最大单页限制数量，默认 500 条，-1 不受限制
        paginationInterceptor.setLimit(500);
        // 开启 count 的 join 优化,只针对部分 left join
        paginationInterceptor.setCountSqlParser(new JsqlParserCountOptimize(true));
        return paginationInterceptor;
    }

    @Bean
    public MetaObjectHandler metaObjectHandler(){
        return new MetaObjectHandler() {
            @Override
            public void insertFill(MetaObject metaObject) {
                LocalDateTime localDateTime = LocalDateTime.now();
                ZoneId zone = ZoneId.systemDefault();
                Instant instant = localDateTime.atZone(zone).toInstant();
                Date date = Date.from(instant);
                this.setFieldValByName("createTime",date, metaObject);
                this.setFieldValByName("updateTime",date, metaObject);
            }

            @Override
            public void updateFill(MetaObject metaObject) {
                LocalDateTime localDateTime = LocalDateTime.now();
                ZoneId zone = ZoneId.systemDefault();
                Instant instant = localDateTime.atZone(zone).toInstant();
                Date date = Date.from(instant);
                this.setFieldValByName("updateTime",date, metaObject);
            }
        };
    }



}
